20 Days in MariupolThe documentary by Associated Press video journalist Mstyslav Chernov has already won awards at several international festivals. It won the first BAFTA Award for Best Documentary in the history of Ukrainian cinema, as well as the Audience Award at the Sundance Film Festival, where it premiered. Chernov himself received an American Directors Guild Award for his film. The film is a compilation of footage by Chernov and his colleagues, Vasilisa Stepanenko and photographer Yevhen Malolietka. The journalists filmed the Russian destruction of besieged Mariupol and were able to cap…